Century 21 Model 570

Description

Medium power solid state cw transceiver covering 80 - 10 meters. Double direct conversion receiver. Built-in AC power supply.

eHam
Product Review, QST, 1977, December (Must be an ARRL member and logged in to view.)

Frequency Coverage: 3.5 to 4.0; 7.0 to 7.5; 14.0 to 14.5; 21.0 to 21.5; 28.0 to 28.5; 28.5 to 29.0 MHz. (Crystal not supplied for 28.5 to 29.0 MHz, but available as accessory, Model 273.) Note - Early models only included crystals for 3.5, 7, and 14 MHz bands. Crystals for 21 Mhz and 28 Mhz bands were available as optional Models numbers 271 and 272.
VFO Frequency Stability: less than 20 Hz change per degree Fahrenheit, averaged over a 40^o change from 70^o to 110^o, after 30 minute warmup. Less than 20 Hz change from 105 to 125 VAC line voltage.
Direct Frequency Readout: Marked in 5 kHz increments from 0 - 500 kHz, MHz markings for each band displayed.
Tuning Rate: Approximately 17 kHz per revolution of main tuning knob.
Power Requirements: 105 - 125 VAC, 50-60 Hz. 10 watts receive, 100 watts transmit.
Semiconductors: 25 transistors, 26 diodes, 5 integrated circuits.
PC Boards: 4 plug-in types, 6 integral.
Construction: Rigid aluminum chassis and sub-panels. Aluminum case. Grey front panel, black textured vinyl cover.
Dimensions: HWD 6.125" x 12.5" x 12"
Weight: 15.5 lbs

Sensitivity: 1 uV or less for 10 dB S+N/N.
Selectivity: Three position; 0.5, 1.0, and 2.5 kHz.
VFO Frequency: 5.0 to 5.5 MHz. Double Direct Conversion.
Antenna Input: 50 ohms, unbalanced.
Audio Output: 1 watt @ 8 ohms, less than 2% harmonic distortion. Built-in speaker; PHONES jack.
Offset Tuning: Approximately +/- 5 kHz, defeatable with ZERO BEAT switch.